1. if perl.path is set in build.properies then this is used ('perl' is concatenated on to the end)
2. failing that, if the environment variable PERLPATH is set this is used (again 'perl' is concatenated)
3. failing that, for Unix systems, 'which' is used to locate it on the path

<!-- windows: just the java stuff. Calling without the "compile" argument first will run winMake.bat with "all" which will then perform both the compile AND link targets in jni/win32.mak (thereby also generating gdbmjava.dll). Then we run the same command with the "install" argument to copy the gdbmjava.dll into the correct location. -->

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<!-- windows: Calling without the "compile" argument first will run winMake.bat with

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"all" which will then perform both the compile AND link targets in jni/win32.mak

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(thereby also generating gdbmjava.dll). Then we run the same command with

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the "install" argument to copy the gdbmjava.dll into the correct location. -->